The Doctor and his friends find themselves in the lost city of Atlantis, where the crazed Professor Zaroff has convinced the people of Atlantis that he can raise their sunken city from beneath the sea. However, the Doctor discovers a terrible secret behind Zaroff's plan — a secret that could destroy all life on Earth.
Patrick Troughton
as The Doctor (voice)
Frazer Hines
as Jamie McCrimmon (voice)
Anneke Wills
as Polly Wright (voice)
Michael Craze
as Ben Jackson (voice)
Joseph Fürst
as Zaroff (voice)
Colin Jeavons
as Damon (voice)
Noel Johnson
as King Thous (voice)
Tom Watson
as Ramo (voice)
Peter Stephens
as Lolem (voice)
Catherine Howe
as Ara (voice)
P.G. Stephens
as Sean (voice)
Paul Anil
as Jacko (voice)
